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Ketoy (or ''Ketoi'') ((ロシア語:Кетой); Japanese 計吐夷島; Ketoi-tō) is an uninhabited volcanic island located in the centre of the Kuril Islands chain in the Sea of Okhotsk in the northwest Pacific Ocean. ==Geology== Ketoy is roughly circular with an area of 73 km² 〔(【引用サイトリンク】title=International Kuril Island Project（IKIP） )〕 and a diameter of 10 km. Its name is derived from the Ainu language for "skeleton" or "bad". The island is a complex stratovolcano lined with steep cliffs ranging from 30 metres to 60 metres on the east and south sides with the west and north being taller. The beaches on the island consist of boulders and stones. In the centre of the island is a 1.5 km wide caldera filled by a freshwater caldera lake. The terrain is undulating and steep with numerous hills, rising to two main peaks: * Ketoy -((ロシア語:влк Кетой); Japanese 計吐夷岳; ''Ketoidake'') with a height of 1,172 meters 〔(【引用サイトリンク】title=Global Volcanism Program )〕 to the east of the central caldera lake * Pallas -((ロシア語:влк Палласа); Japanese 白烟山; ''Shirokemuriyama'') with a height of 993 meters in the center of the island. Pallas also has a caldera lake, with diameters of approximately 550 meters. Ketoy is still an active volcano. A major eruption occurred from 1846 to 1847, with the last known eruption in 1960, and August 9, 2013.〔 http://www.volcano.si.edu/world/volcano.cfm?vnum=0900-20=&volpage=erupt〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ketoy」の詳細全文を読む スポンサード リンク
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